The SM420 is still a direct drive transmission with 1:1 ratio in 4th gear, just like most other manual transmissions.

You might be better off with the 3.73 the seller has listed if your staying with a 6-cylinder engine.

Mike B smile


Mike Boteler

1956 Chevy 3100 Resto Rod
1952 Willys M38 Army Jeep
1983 Jeep CJ7 Laredo
1984 Jeep CJ7
+++++
Silver Spring, MD